The institutional organization chart was reviewed to determine the operational offices in 2021, then an on-site visit was made to the University's facilities in order to recognize the emission sources associated with administrative activities: fixed equipment, air conditioning leaks, LPG consumption in canteens, SEIN electricity consumption, drinking water consumption, ink and toner consumption, waste generation and GHG paper consumption.

The methodological criteria established by the GHG Protocol and the International Standard ISO 14064-1 were followed.

Table 4 details the information requested from the heads of the different administrative areas of the UNJ.

To facilitate the systematization, standardization, and processing of the data, a spreadsheet format was prepared in Excel application software, where monthly information was recorded on consumption by the level of activity (fuel and electricity consumption). The formats were adapted from the Eco-efficiency Guide for Public Sector Institutions [6].

For the calculation associated with per capita energy consumption (CE per capita), the total consumption of electrical energy (CEt) was divided by the number of UNJ workers (N°. of collaborators) [13], as shown in Eq. (1).

For the calculation of HC, based on Scope 1, the guidelines indicated by the Intergovernmental Panel on Climate Change were verified for the preparation of national inventories in 2006 [14], and for Scope 2 those established by Peru [10].

Next, the equations for calculating the carbon footprint are presented, the same ones that were adapted by Rita E. Morales, [7].

a. Conversion and emission factors were selected and these values were recorded in order to quantify the GHG emissions (CO₂, CH_4, and N₂O) generated by activity level.

b. For fuel consumption, the equivalent associated with each fuel was calculated, in terms of heat, expressed in Terajoule (TJ), by multiplying the total fuel consumption per level of activity, expressed in physical units consumed by the caloric value according to the type of fuel, according to Eq. (2).

Where U is the physical units of fuel consumed expressed in Gallons (Gal); V, the calorific value expressed in terajoule over gallons (TJ/Gal); E the energy consumption of the fuel expressed in terajoule (TJ).

The values of V were extracted from [15], which are the calorific powers established for fixed and mobile equipment as detailed in Tables 5 and 6.

c. With the energy consumption data for each fuel, the conversion to GHG emission equivalent was performed, the operation is represented in Eq. (3).

Where, GHG emissions are CO₂, CH₄, and N₂O emissions expressed in Tons (t); NA expresses the level of activity as fuel consumption expressed in terajoule (TJ) and energy consumption expressed in kW/h; FE is the emission factor expressed in Kg/TJ for fuel consumption. The emission factors used are detailed in Tables 7 and 8.

Table 5

Fuel	Caloric value	Unit
Gasoline 90	1.20E-04	TJ/gal

Source: MINAN (2016).

Table 6

Fuel	Caloric value	Unit
Diesel	1.35E-04	TJ/gal
Gasoline 90	1.18E-04	TJ/gal

Source: MINAM (2016).

Table 7

Source: IPCC (2006).

Table 8

Source: The authors.

d. To quantify GHG emissions (CO₂, CH₄ and N₂O), total GHG emissions were calculated, expressed in tons of carbon dioxide equivalent (tCO₂). The calculation was made by multiplying the GHG emissions (CO₂, CH₄ and N₂O) expressed in tons, by their corresponding global warming potential. The operation is expressed in Eq. (4).

Table 9

Source: The authors.

Where, GHG ET, are the total GHG emissions expressed in tCO₂eq; GHG Emission, those Emissions of CO₂, CH₄ and N₂O expressed in tons; GWP, the Global Warming Potential of GHG.

Table 9 shows the list of the 29 administrative offices that were in operation on a face-to-face basis at the National University of Jaen for 2021.

Table 10 shows the operational limit of the UNJ which is divided into direct emissions (fuel consumption) and indirect emissions (electricity consumption).

Emission sources were divided by scope and by activity, where own and stationary vehicles were placed in scope 1 and electricity in scope 2, as shown in Table 11.

Table 12 shows the total fuel consumption by mobile equipment, which was 1,574.66 gallons, while the consumption by fixed equipment was 12 gallons, resulting in a total of 1,586.66 gallons for both sources.

Table 10

	Scopes	Activity
Direct Emissions	Scope 1	Fuel Consumption
Indirect Emissions	Scope 2	Electricity Consumption

Source: The authors.

Table 11

Scopes	Activity	Emission source
Scope 1	Fuel consumption	Own vehicles Fixed equipment
Scope 2	Electricity consumption	Electricity

Source: The authors.

Table 12

Month	Emission Source	Consumption (Gal)
		Mobile equipment	Fixed equipment
January	Mobile fuel consumption	124.4	0
February		105.53	0
March		120.21	0
April		248.84	0
May		122.44	4
June		160.465	4
July		121.42	4
August		125.88	0
September		82.59	0
October		109.38	0
November		142.25	0
December		111.25	6
Total		1574.66	12

Source: The authors

The UNJ consumed a total of 1,341.66 gallons of diesel (D-EM) fuel and 233 gallons of gasoline for its mobile equipment (G90-EM), while the consumption per fixed equipment was 12 gallons of gasoline (G90-EF) as shown in Fig 2. The low consumption of diesel fuel is due to the fact that the university only used diesel fuel for the use of two motorcycles, which were used for short trips.

Figure 2 Source: The authors.

Table 13.

Meter	1	2	3
Nº serial	00018569384	607906171	000JB005228
Connection type	3φ	1φ	1φ

Source: The authors.

In 2021, the UNJ provided its academic and administrative services at its main headquarters, which was located on Cuzco Street and had two meters (single-phase and three-phase). For storage operations, it was supplied with a single meter (single-phase) for electricity consumption. These offices are no longer part of the UNJ since June 2021. Table 13 shows the serial number and connection type of the meters mentioned above.

According to Table 14, electricity consumption in 2021 was 87,629.05 kW/year, with February being the month of lowest consumption with a value of 4,282.18 kW and November the highest with 12,168.92 kW, also from September-December electricity consumption is higher.

According to equation (1), per capita energy consumption was 1 091.61 kWh per year, that is, each administration accounted for 1.24% of total electricity in 2021.

Table 14

Month	Emission Source	Consumption (kW/ month)
January	Electric power	4,532.09
February		4,282.18
March		5,367.75
April		4,401.77
May		5,461.62
June		4,952.00
July		5,315.07
August		7,845.72
September		11,047.50
October		10,311.40
November		12,168.92
December		11,943.04
Total		87,629.05

Source: The authors.

Table 15

Source: The authors.

A total of 29.1364 tCO₂, 0.0464 tCH_4, and 0.2108 tN₂O were generated. The fixed equipment emission source was the one that emitted the least GHG with a representation of 0.0998 tCH₄, 0.0004 tCH₄ 0.0002 tN₂O, (Table 15).

More tons of CO₂ and less CH₄ were released, with a range difference of 28, 9256 t, as seen in Fig. 3.

Figure 3 Source: The authors.

Figure 4 Source: The authors.

Scope 1 emitted 15.4264 tCO₂, 0.0456 tCH₄ and 0.2107 tN₂O and scope 2: 29.1364, 0.0464 and 0.2108 t for CO₂, CH₄, N₂O (Fig. 4).

The monthly median carbon emissions resulting from electricity use (Scope 2) showed a significant difference (p = 0.021) during the study period. In contrast, gasoline use (Scope 1) showed no significant difference in carbon footprint (p = 0.139). Regarding the carbon footprint the monthly mean is 2.450 tCO₂eq, the median 2.455 tCO₂eq, the variance 0.264 tCO₂eq and the deviation has a value of 0.514 (Table 17).